ARTA

[DcibeL]

No argument here.
But isn't this diyAudio where people thrive on fixing and modding bargain products?

By all means, don't let me stop you.

 

[hifijim]

My new Motu M2 arrived yesterday. Doing the simple loop-back performance...

A pretty substantial improvement over the Behringer UMC202HD in terms of noise and distortion... As I said a few posts back, the Behringer is perfectly serviceable for collecting data for use in crossover design. But I wanted something with lower noise and distortion, and that is definitely what I got. Noise is consistently -120 dB, and THD is consistently less than 0.01%

 

[bucks bunny]

This is not would I would expect from the Motu, did you use mic input?

 

[hifijim]

I'm not sure what you mean. I used the left/right loop-back setup as shown in the ARTA manual Figure 1.9

 

[NiToNi]

I've ordered one of those clone IEC 711 couplers from Aliexpress to play around with and measure my IEMs.

Many IEMs are multi-way but the individual drivers (DD, BA, EST, BC, planars, piezo) can't be disconnected and measured individually obviously.

Is there some measurement technique using ARTA that could be used to determine the crossover frequencies between the drivers?

 

[mlloyd1]

My new Motu M2 arrived yesterday. Doing the simple loop-back performance...

are you using ASIO with your MOTU M2?
i just ordered one to replace an OLD sound blaster that I've had enough of ...

 

[hifijim]

are you using ASIO with your MOTU M2?

I don't think so... it came with drivers, but they might be some version of ASIO, I am not sure... I must confess that I am barely literate when it comes to PC-based audio. I mostly copy what other people have done. When @HeadShake was in my town, I would ask him this kind of question...

 

[DcibeL]

ASIO always, except for use with APO EQ. In ARTA, the device that isn't labelled "WDM" is the asio driver.

 

[hifijim]

Just to close the loop on this, here is my "audio device setup"...

When I installed the Motu driver and plugged in the Motu M2, this setup menu gave me three options

So this is why I was not able to say that I was using ASIO drivers... I am glad that folks like DcibeL can advice us on what to do and what it means...

 

[DcibeL]

You chose correctly . Main benefit for ARTA is that you can change sample rate Willy nilly within the software without having to worry about Windows settings.

 

[mlloyd1]

I ended up getting an MOTU M4 instead; I read the ADC was slightly better and I won't be looking to buy another audio interface soon.
I can already see it is quite a bit better than my old sound blaster .... ARTA and REW are great tools!

 

[gdan]

I measured recently with ARTA, a DSP based speaker. I noticed the following:

In the first measurement of the Impulse response, the polarity was positive.

In the next measurement, with no change in the setup, the polarity was inverted and became negative.

Out of 15 succesive measurements that I took, 7 of them were positive and the rest were negative.

Is it possible this to be a problem of ARTA ?

Does anyone else noticed the same issue ?

 

[DcibeL]

Easy to determine yourself, measure other normal speaker without DSP in the loop.

Polarity is 100% correct in all measurements made with ARTA, it would be a very detrimental error if that were not the case.

 

[gdan]

Yes, I did that, I measured a single driver without any DSP processing, the polarity was always the same.

But I wanted to know if someone else noted the above, to be sure that this is not an ARTA issue.

 

[hifijim]

when you send the test signal to the speaker, are you sending an analog signal or a digital signal? I have never noticed the phenomenon you describe, but my active speakers always use an analog signal as input.

If you are sending a digital signal to the speakers, is it a USB input, or a SPDIF, or something else ??

 

[gdan]

The test signal is analog, 256k sweep. It is going to the line input of the DSP speaker.

 

[stoneeh]

I see ARTA 1.9.7 has been released.

Changelog: https://artalabs.hr/news.htm

Download: https://artalabs.hr/download.htm


Thank you for reacting to and fixing one of my earlier bug reports, number of overlay lines within the "Copy" & "Add filename" feature in ARTA.

Still broken: "Add filename" in the graphical export in STEPS's "Loudspeaker distortion limited SPL" tab is still without function.


Would it also be possible to introduce the same pre-delay for soundcard sample rate changes that you just implemented in ARTA into STEPS? That would be a big help, for example to try to fix this problem -> Post #1377

 

[iMat]

I put ARTA version 1.9.7 on Web site. I've postponed release information to users , as I wait that Microsoft remove download protection.
It usually requires 3-5 days.
This version is not bug clearance version. I have just added most wanted ARTA features.
I will monitor user response to remove possible bugs.

Ivo

 

[stoneeh]

This version is not bug clearance version.
I will monitor user response to remove possible bugs.

The bugs I cited were reported in 2021.

 

[DcibeL]

Please consider for future development of ARTA:
-include option for left window
-include option to display phase of overlay traces
-sine sweep in LIMP, for faster results vs slow stepped sine.
-frequency range limits for since sweep in ARTA, for easier distortion analysis of tweeters without additional protection or slow stepped sine.
-distortion analysis - please allow display of relative harmonic level in dBr instead of %.
-distortion analysis in ARTA - please add display of H5.
-option to retain zoom,gain,offset settings when new measurement is completed.